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• FFMPEG UDP MPEG2TS to Cable TV Channel - Video & Audio Problems

  30 janvier 2019, par user2884023

  Channel Feed Distored Picture

  $ ffmpeg
  
  -re
  
  -i playlist1.txt
  
  -b:v 15000k 
  
  -bufsize 15000k
  
  -maxrate 16000k
  
  -f mpegts "udp://XXX.XXX.X.XXX:XXXX"

  I have mpeg2.ts files encoded to CBR15mbs.
  The files are set to different frame rates. Although initial testing was just playing 1 file.
  They are currently 1080p I think without declaring the frame rate, they are defaulting to 30fps.
  From the server locally via Port2 (that we are using to send our feed), everything plays fine via FFPLAY.
  The final out put local CATV is pixelated and distorted, the video is missing data playing slowly and the audio is choppy / distorted.
  I even tried just a 192kps .mp2 and it played distorted on the CATV channel.
  They set me up with a cable modem. 2 ports, 1 WAN, 1 a dedicated port to feed their head end and I have a fiber synchronous 20/20 connection.

  I am guessing its a packet issue, perhaps on our end with our FFMPEG setup ? And maybe FFPLAY isn’t as sensitive to the actual distro process.

  Perhaps the secret lies here, but there isn’t much info about them, even scouring the net.

  ?pkt_size=188&buffer_size=65535

  For example what is this one :

  broadcast=1|0

  Explicitly allow or disallow UDP broadcasting.

  I apologize if data is missing, please ask questions. I didn’t want to write a novel.

  I am hoping some can provide the correct code so my signal is corrected. I assume the problem is on our end, and not the CATV end. At least I can try some solutions on our end first. I can make real-time FFMPEG changes to the server, and see the channel results instantly so that helps.

  Finally, the fact it wouldn’t even play a .mp2 audio file cleanly on the channel, does make me wonder, is there a problem on their end, or is it a config on our end, and we just need the correct answer ?

• HEVC File bigger after converting from h264

  26 janvier 2019, par Aaroknight

  I’m currently working an an automated Python script for indexing and converting all my movies and episodes with ffmpeg. I use subprocess.call() for running the ffmpeg command and tested this command with some movies. As expected the big h264 files were converted to merely one third of what they used to have.

  But now that I was testing the method I found that a converted episode (about 400MB in h264) had over 1,6GB in hevc. I have absolutely no idea why the new file would be that much bigger in hevc.
  This is my code :

  def convert(path):
  
      outvid = path.strip(".mkv") + "h265.mkv"
  
  
  
      cmd = ["ffmpeg", "-i", path, "-map", "0", "-map_metadata", "0", "-map_chapters", "0", "-c:v", "libx265",
  
             "-c:a", "copy", "-c:s", "copy", "-preset", "ultrafast", "-x265-params", "lossless=1", outvid]
  
      subprocess.call(cmd)
  
  
  
  convert("/Volumes/2TB/Black Butler/Season 1/Black Butler S01E01.mkv")

  I don’t have that much experience with ffmpeg, nor with subprocess. This is one of my first bigger projects. I hope someone can tell me what the problem might be.

  UPDATE
  Problem applies only for small video files. I now just check for the file size and skip the small files. Wouldn’t have made much of a difference anyway.

  

• FFMPEG Stream video and capture frames every x minutes

  12 octobre 2018, par guitarultimate

  I’m trying to use ffmpeg on a raspberry pi zero with a camera to stream live video and capture images every x minutes at the same time.

  I am able to do either style output (stream or save image) by itself, but when trying to split the output the stream feed always cuts out when it tries to save the image.

  I am using a command like :

  raspivid -o - -t 0 -w 1280 -h 720 -fps 30 -b 8000000 -g 30 | ffmpeg -re -ar 44100 -ac 2 -acodec pcm_s16le \
  
  -f s16le -ac 2 -i /dev/zero \
  
  -f h264 -i pipe:0 -c:v copy -c:a aac \
  
  -ab 128k -g 30 -strict experimental \
  
  -f flv -r 30 rtmp://a.rtmp.youtube.com/live2/{secret} \
  
  -f image2 -vf fps=1/60 img%03d.jpg 

  and receive an error message like :

  av_interleaved_write_frame(): Broken pipe
  
      Last message repeated 1 times
  
  [flv @ 0x3766930] Failed to update header with correct duration.
  
  [flv @ 0x3766930] Failed to update header with correct filesize.
  
  Error writing trailer of rtmp://a.rtmp.youtube.com/live2/{secret}: Broken pipe
  
  frame=  253 fps=6.0 q=-1.0 Lq=0.0 size=       7kB time=00:00:10.12 bitrate=   6.0kbits/s speed=0.242x
  
  video:1508kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

  Running either output on it’s own with the same inputs executes perfectly fine.

  Any help on how to acheive this ?